Finding the Fourth Proportional to 105,590.40, 145,714.32 and 57,846.72

Step by Step Solution

1. Step 1: Write the proportion equation
   105,590.40 : 145,714.32 = 57,846.72 : x
2. Step 2: Convert to fraction form
   105,590.40/145,714.32 = 57,846.72/x
3. Step 3: Cross multiply
   105,590.40x = 145,714.32 × 57,846.72
4. Step 4: Simplify right side
   105,590.40x = 8,429,095,469.03
5. Step 5: Solve for x
   x = 8,429,095,469.03/105,590.40
6. Step 6: Final answer
   x = 79,828.24